Apparatus and method for forming corrugations in tubing



J. B. FRIEDMAN APPARATUS AND METHOD FOR FORMING CORRUGATIONS IN TUBING March 17, 1953 4 Sheets-Sheet 1 Filed Sept. 20, 1948 IN vz/vroie. JOSEPH 5. FRIEDMAN BY HIS A 7'7'0 RNE Y5. HA ems, K/scH, F05 T5,? & HARE/5 6r March 17, 1953 J B. FRIEDMAN APPARATUS AND METHOD FOR FORMINGv CORRUGATIONS IN TUBING Filed Sept. 20, 1948 4 Sheets-Sheet 2 //v VENTO 1?.

JOSEPH 5. FRIEDMAN BY H/S ATTORNEYS.

HARRIQ/(IECl-L FOSTER &HARR/$ 5v March 17, 1953 J. B. FRIEDMAN 2,631,645

APPARATUS AND METHOD FOR FORMING CORRUGATIONS .IN TUBING Filed Sept. 20, 1948 4 Sheets-Sheet 4 /N VENTOR.

dose/=14 B.F/?/EDMHN BY 11/: n TTORNE Y6.

HARE/.5} K EChQ Fosrale & HARP/s wide variety of materials.

Patented Mar. 17, 1953 APPARATUS AND METHOD FOR FORMING CORRUGATIONS IN TUBING Joseph B. Friedman, Maywood, Calif. Application September 20, 1948, Serial No. 50,082

tions in tubing.

Although the apparatus and method which are the subject matter of my invention are described as utilized in forming circumferential corrugations in tubing made'of paper, it is not intended that the invention be limited to the creation of circumferential corrugations in tubing formed of any specific material since theprinciples of the invention can, obviously, be readily applied to creating corrugations in tubing formed from a 'In addition, although the invention is shown and described as applied to the formation of circumferential corrugations in tubing which are helical in configuration, it

is not intended that the invention be limited to the formation of such helical configurations since it is possible that circumferential corrugations other than those of the helical type may be formed by my apparatus in accordance with the method described below.

It is customary, at the present time, to form corrugations in relatively thin walled tubing in order that the tubing may be rendered flexible in nature and that it may be applied in places and to uses where conventional rigid or semirigiditubing would not be usable. Many ways have been devised for forming such circumferential corrugations in tubing but one of the most obvious and widely utilized apparatus and methods consists in supporting a'tubing upon the surface of a mandrel which has formed therein the configuration of thecorrugation which it is desired lee-imparted to the tubing.

After the tubing is supported from the corrugated mandrel, a number of die members are applied 'to the external surface of the tubing and the mandrel or the die members are rotated. As the relative rotation between the mandrel and the die members takes place,- the die members force the material of the tubing into the grooves which are formed bythe corrugations in the mandrel. The relative rotation of the mandrel in'respect to the die members causes the axial movement of the mandrel in relation to the die members'and results in the formation of corrugations in the'wall of the tubing, However, since only so much of the tubing area can bedevoted to the formation of the corrugations therein as l lies upon the corrugated portion of the-mandrel, it is obvious'that a certain amount of stretching of the material of the tubing as it is forced into the grooves, constituted by the corrugations of the mandrel must take place. Qonsequently, the

to an apparatus for and I I of the corrugations.

31 Claims. (01. 154-30) stretching of the material of the tubing is accompanied by a thinning of the wall of the tubing in the region of the corrugations. Such diminution'of'the wall thickness of the tubing in the corrugated area cannot be accurately controlled and thereforeit is necessary to provide a wa1'l"thickness of a much greater strength than would ordinarily be necessary for the uses to which the tubing is" tobe applied in order to assure that, when the tubing has been corrugated by'the above-described method, the wall thickness in the corrugated region will be ample to sustain'the loads imposed upon the wall of the tubing in the corrugated area.

It is, therefore, aprimary object of my invention toprovide'an apparatus for forming circumfere'ntial corrugations in tubing which will permit the formation of such corrugations in the wall of the tubing without materially diminishing the wall thickness of the tubing in the region The wall thickness of the tubing can be determined prior to the formation of the corrugationstherein and the provision of a corrugated area whose wall thickness is substantially equal tothat of the initial wall thickness ofthe tubing is assured. Thus, the necessity for the provision of tubing having greater wall thicknesses than necessary, as is conventional practice, is eliminated.

One of the greatest obstacles encountered in the formation of circumferential corrugations in tubing by the utilization of the above described corrugated mandrel in conjunction with dies adapted to be applied to the exterior surface of the tubing lies in the fact that, once the material of the tubing is drawn downwardly into the configurations of the mandrel, it is necessary to thread the tubing ff the mandrel in order to accomplish its .removaltherefrom. Since the material of which the tubing is composed is frequently forced'into the corrugations of the mandrel by the dies with considerable pressure,

-it is a problem to remove the tubing from the mandrel after the corrugations have been formed therein.

It is another object of my invention to provide an apparatus for forming circumferential forming circumferential corrugations in tubing in which the forming means includes a mandrel adapted to support the tubing in the process of forming the corrugations therein which has a smooth periphery. Thus, the problems encountered in prior art methods in the removal of the tubing from the forming means are eliminated by my invention.

An additional object of my invention is the provision of an apparatus for forming corrugations in tubing which has embodied therein automatic feeding means adapted to feed predetermined lengths of tubing to be corrugated to a receiving means which, in turn, is designed to transfer the tubing to the aforementioned forming means.

A further object of my invention is the provision of an apparatus for forming circumferential corrugations in tubing havingrembodied therein an automatic feeding means for feeding predetermined lengths of tubing which includes Wiper means adapted to simultaneously urge some "of said tubings downwardly toward" said aforementioned receivingim-eans and associated wiper means adapted to urgethelarger portion of said tubings away from said receiving'means to prevent the jamming of said tubingsin'said feeding means.

Another object of -my invention' is. the provisionof a receiving" meanswhich is adapted to be rotated relative to said vfeeding means from a first, loading stationinto 3..SBG'O1ICL. charging station and thenceinto a third, idischarging station.

Itis a further objectofimyyinvention to provide an apparatus for automaticallyrorming corrugations in the body of'tubing which has embodied therein receiving": means adapted to be rotated'into a first;loadingstation in whichsaid tubings are automatically dischargedifrom-said feeding means into said receiving means, thence into a second, charging station :in'which' said tubings are charged automatically'from said receiving means into said forming/means; and thence into a third, discharging station in which said tubings are automatically removed'from said forming means and discharged into a receptacle.

It is an additional object of my invention to provide a receiving means adapted to automatically chargeand 'dischargesaid tubings into and from said feeding means which includes charging and dischargingmeans.

It is a further object of my inventionto provide an apparatus .for forming circumferential corrugations in tubing including a'forming means which is adapted to cooperate with said receiving means and which embodies amandrel adapted to support thetubings .chargedthereupon from said receivingx means,-. saidv mandrel having a smooth peripheraiarea.

It is another object of my-invention'to provide 1 an apparatus for forming circumferential: corrugations tubingv which includes .a forming means having a mandrel upon whichthe tubin is adapted to be'supported during the process of forming said circumferential corrugations. therein and a die member which is adapted topimpinge upon .the peripheral. area .of said tubing to :form

4 ciated with the aforesaid mandrel which is automatically actuated to impinge upon the periphery of the tubing after it has been charged upon the mandrel and which is subsequently automatically actuated to release said tubing prior to its discharge from said mandrel.

Another object of my invention is the provision of an apparatus adapted to form circumferential corrugations in tubings which. includes a. mandrel having a smooth surfaced peripheral area which is adapted to cooperate with an automatically actuatable die member and which is adapted to be axially shifted in reference to said die member.

An additional object of my invention is the provision of an apparatus for forming circumferential corrugations in tubing which includes a mandrel having a smooth peripheral area and an automatically actuatable die member in reference to which said mandrel is adapted to be axially shifted, saidmandrel having incorporated thereupon gripping' means adapted to grip. one end of said tubing to prevent the relative rotation or axial shifting of said tubing in reference thereto.

A further object of myinvention is the .provision of zan apparatus for forming circumferential corrugations in tubing which includes a mandrel having a-smooth periphery. and a gripping, means adapted to secureoneendof a tubing upon said mandrel againstrelative rotation or axial movement in reference thereto, said man- .drel. being adaptedto cooperate with. automatically actuatable...die..meansland .being axially shif table in reference thereto.

A further object .ofiny invention. is the .provision of amandreliwhich isadapted tohave one end of a tubing fixed thereupon againstrelative rotational .oraxial movement and which has its other end adapted to. support theiree end of said tubing between thejaws. ofian automatically actuatable die member, .said die member being adapted through the intermediary of a score line formedthereby upon the periphery of said tubing to shift said mandrel along its axis.

A further object .of my invention is to provide a motion limiting means which is adapted to controlthe amount. .of axial movement of said mandrelinduced by said die member in such a manner that theaxial movement .of said mandrel will be limited in rieferencetothe lead of the score .lines formed in the periphery of the tubing by said die member.

It is another object ofv my invention to provide a method of forming corrugations in tubing which will permit the formation of said corrugations Without materially diminishing the. wall thickness of the vvtubinginthe corrugated.areathereoi.

It .is an additional object of my invention to provide a method .ofform-ing corrugations in tubings which will eliminate the problem of placing said tubings upon: and removing said tubings from said forming means.

It is an additional object of my invention to provide anapparatus .for forming circumferential corrugations in tubings Which is relatively simple inv construction and-which is adapted to function. with aminimum of maintenance.

.It is an additionalobject of myinvention to provide an. apparatus which is extremely flexible in nature and in which both the number of corrugations and thedepths thereof which are formed in thetubings can be accurately controlled.

Itis another object .of my invention to provide nuances a method and apparatus for forming circumferential corrugations in tubings which will materially reduce. the expense of forming such corrugations and which will thuspermit the substantial reduction in cost of such corrugated tubing.

Other objects and advantages of my invention will become apparent from a perusal of the following specification and the accompanyin drawings, which are for the purpose of illustration only, and in which: v

Fig. l is a perspective view showing an'apparatus for forming circumferential corrugations in tubings constructed in accordance with my invention;

Fig. 2 is an enlarged, cross section of the forming means embodied in the apparatus of Fig. 1;

Fig. 3 is an enlarged, cross section'of the forming means of the apparatus shown in Fig. 1 in the process of forming circumferential corrugations in a tubing;

Fig. 4 is an enlarged, cross section of the forming means of the apparatus shown in Fig. 1, near the completion of the process of forming circumferential corrugations in a tubing;

Fig. 5 is a development of a cam which constitutes the motion limiting means adapted to cooperate with the mandrel of the forming means of my invention;

Fig. 6 is an enlarged, fragmentary elevational view taken on broken line 6-6 of Fig. 2;

Fig. 7 is an enlarged, fragmentary elevational view of the die means embodied in the apparatus for forming circumferential corrugations;

Fig. 8 is an enlarged, fragmentary view showing the die means in closed position;

Fig. 9 is a fragmentary, enlarged elevational view taken on broken line 9-9 of Fig. 8;

Fig. 10 is a fragmentary, enlarged elevational view taken on broken line ill-Ill of Fig. 8;

Fig. 11 is a vertical enlarged sectional view taken on broken line I i of Fig. 3;

Fig. 12 is a vertical, enlarged sectional View taken on broken line i 2-! 20f Fig. 3;

Fig. 13 is an enlarged, vertical sectional view taken on broken line I3-i 3 of Fig. 1;

Fig. 14 is an enlarged sectional view of a tubing with corrugations formed therein; and

Fig. 15 is a longitudinal sectional view of an alternative embodiment of the forming means of my invention.

Referring to Fig. 1 of the drawings,I show an apparatus iii adapted for the formation of circumferential corrugations in tubings which includes a base i 1 comprising a longitudinally extending bedplate i2 which is supported upon leg members l4 disposed at either end thereof. The apparatus Hi includes a feeding means I5 which is adapted to contain a number of predetermined lengths of tubing 16 and which is adapted also to transfer individual tubings to a receiving means I! which is disposed below the feeding means i5. Juxtaposed to one end of the receiving means I! is a forming means !8 which is adapted to receive the tubings from the receiving means I! and to form circumferential corrugations in the peripheries of the tubings and which is adapted to have the tubings discharged therefrom back onto the receiving means by the use of appropriate charging and discharging means which will be described in greater detail below. A receptacle l9 which is placed below the opposite end of the receivin means I! tothat juxtaposed to the feeding means 15 is adapted to receive the lengths of tubing l6 after the corrugations have been formed inthe peripherieslthereof.

"the receiving means I l.

Mounted upon a bed 20 which is supported from the bedplate l2 of the base ll through the medium of hangers 2| is an electric motor 23 which is adapted to supply the motive power for the apparatus II] in a manner which will be described in greater detail below.

As is best shown in Figs. 1 and 13 of the drawings, the feeding means [5 includes a hopper 25 having a main body portion 26 and an auxiliary body portion 21 mounted on the bedplate 12 of the base H through the medium of frame members 28. The main body portion 26 of the hopper 25 constitutes a container 30' which is adapted to receive a plurality of predetermined lengths of tubing I 6 and which is adapted to supply said lengths of tubing to a channel 3| constituted by the auxiliary body portion 2? of the hopper 25. The auxiliary body portion 2'! of the hopper 25 is disposed at the front of the hopper and is somewhat greater in length than the main body portion 25 of the hopper although it is only of sufficient width to receive one length of tubing H5 at a time.. In other words, the in-- ternal dimensions of the channel 3| constituted by the auxiliary body portion 21 are such that it is greater in length than the length of tubing adapted to be carried therethrough but it is only of slightly greater width than the diameter of the tubing to permit the passage of a single tubing I6 through the confines of the channel 3!. Thus, the individual lengths of tubing It are arranged in a single file one on top of the other in the channel 3! preparatory to being fed there by onto the receiving means I 1.

An elongated vertical opening 33 is formed in the face of the auxiliary body portion 21 of the hopper 25 and a horizontally disposed elongated opening 34 is formed in the underside of the hopper 25 at the juncture of the'main body portion 26 with the auxiliary body portion 2'3. It is obvious that the length and width of the openings, as shown in the drawings, can be easily altered to accommodate the particular dimensions of the tubings being passed through the feeding means i5 and it is not intended that the size of the openings and their particular orientation be a limiting factor.

Juxtaposed to the verticall disposed, longitudinal opening 33 in the auxiliary body portion 2-? is a first wiper element 36 which includes a flexible tongue 3'! adapted to contact the peripheral area of the tubings l6 preparatory to their descent by gravity into the channel 3! constituted reference tothe vertical opening 33. The shaft 4! is rotatably journalled in bearings 42 which are supported upon frame members :33 suitably fastened to the bedplate l2 and the rotation of the shaft 4| in the bearings 42 causes the concomitant rotation of the first wiper element 36. The shaft M is so rotated that the tongue 31 of the first wiper element 36 tends to urge or propel the tubings l6 downwardly in the channel 3i and thus prevents a gap between the tubings within the channel 3| and eliminates the'possibility that the tubings [6 will not be continuously fed to Secured to the end of the shaft 4! and adapted to'cause its rotation 7 in-the appropriate directiomis a pulley 45 which is adapted to be driven in a manner which will be described in'gre'ater detail below.

Juxtaposed to the longitudinal opening at formed in the hopper 25 at the juncture of the main body portion'it with the; auxiliary body portion 21 is a second wiper element 4'! which includes an elongated, corrugated, cylindrical member 48 which is rotatably mounted. upon a shaft 49. The ends of the shaft 49 are mounted in bearings supported upon the frame mem bers 43 and a pulley 52 is secured. to one end thereof. Trained-upon the pulley '52 is a belt 53 which is adapted to establish an operative relationship between the shaft 49 and the shaft M by being trained upon a pulley 5 mounted upon the shaft 4|, In this manner, the shaft 4e supporting the second wiper element A! is adapted to be rotated concomitantly with the shaft 4 i.

As may be best seen in Fig. 13 of the drauings, the shaft 4% and the shaft 49 rotate in a counterclockwise direction and also rotate at the same speed. However, the first wiper element 3?: serves to urge or impel the individual lengths of tubing l5 downwardly in the channel 3; in order to prevent a gap from occurring in the line of tubing established :in the channel 3 I, while the second'wiper element 41, through the medium of the contact of the corrugated cylinder 43 with the periphery of the individual lengths of tubing I 5 at the juncture of the auxiliary body portion. 21 with the main body portion 26 of the hopper, serves to urge the individual lengths of tubing 16 upwardly to prevent the jamming of the lengths of tubing at the point where they enter the channel 3i and. thus eliminates the possibility that the tubings become jammed at the entry to the channel 3i and the possibility that the automatic feeding of the tubing id to the receiving means H be cut off. Thus, the feeding means I5 through the cooperation of the first wiper element 35' with the second wiper element serves to provide a constant and unimpeded :iow of individual lengths of tubing I5 to the receiving means I I.

As best shown in Figs. 1 to 4, 6 and 13 of the drawings, the receiving means Hincludes an elongated, horizontally disposed drum 58 which is mounted upon a first drive shaft 59 and is adapted to be rotated thereby in close juxtaposition to the lower end of the channel ill of the auxiliary body portion 2'! ofthe hopper 25 and which is adapted to receive individual lengths of tubing I 6 therefrom. The first drive shaft 59 is journalled in bearings 60 which are sup ported upon standards 52 suitably secured to the bedplate I2 at either end thereof. Fixed to one end of the first drive shaft 59 is a V-type pulley 64 which has trained thereupon a -belt 65 which is, in turn, trained upon a'pulley 66 mounted upon the shaft 67 of a gear reducer 58. The gear reducer 68 is, in turn, driven by the shaft 69 of the electric motor 23 and serves to substantially reduce the speed of revolution of the motor 23 to a predetermined extent so that the first drive, shaft 5s and the component of the apparatus Ill mounted thereupon may be rotated at a substantially constant reducedspeed in reference tothe. other elements of the apparatus is which are driven directly from the shaft 69 of the motor 23 in a manner which will be described in greater detail below. Thus, the drum 58 of the receiving means IT is continuously rotated below the opening constituted by the lower endofthe channel 3|.

.Formeddn the periphery of the drum 58 and extending substantially parallel to the axis thereofwis a plurality of receptacles I I which are constituted by: elongated, longitudinal, substantially hemispherical slots 12 which extend from one end of the drum to the other. The slots I2 are adapted to receive the lengths of tubing I6 from the lower end of the channel SI of the hopper 25 and areadapted also to be rotated into a first, loading station, a second, charging station and a third, discharging station.

. As best shown in Figs. 1 and 6 of the drawings, the elongated slots 72 are adapted to be rotated from, a first, loading station I35 in which the tubings l6 drop into the slots 12 into a second, charging station I 86 in which the tubings are charged from theslots 12 into the forming means 18 and thence into a third, discharging station I 81 in which thetubings I 6 are withdrawn from the forming means I8 and discharged through the'slots '72 into the receptacle I9. In this manner, the individual lengths of tubing I5 are automatically expelled from the lower end of the channel 3-! of the hopper 25 into the receptacles 'll constituted by the elongated slots I2 of the drum 58 and the point of expulsion of the individual lengths of tubing 13 into the slots I2 is denominated as the first, loading station I85.

As is mostly clearly shown in Fig. 6 of the drawings, a charging means Ila is juxtaposed to the position which the slots I2 assume in relationship to the feeding means I5 when they enter the second, charging station, I85. The charging means I!!! is supported on hangers I59 and includes a motor Ill and which has associated therewith in driven relationship a wheel I12 which is adapted to contact the periphery of each tubing l5 and by its clockwise rotation to charge or expel the individual lengths of tubing It at the second, charging station into the forming means I8. The motor Ill of the charging means I'Ill is ahigh speed motor and, the wheel I12 driven thereby rotates at the same high speed and the charging of the forming means I8 with the individual lengths of tubing I5 is thus expeditiously and easily accomplished. The wheel I12 may be formed of rubber or a similar material having a high coeflicient of friction in order that the tubings may be readily expelled or charged into the forming means I B.

Juxtaposed to the third, discharging station I8? is a discharging means H3 which comprises an electric motor I74 which is adapted to drive a wheel H5 similar in all respects to the wheel H2 of the charging means I36. However, the wheel I15 of the discharging means H3, as best seen in Fig. l of the drawings, is driven in a counterclockwise direction andthus, when contacting the periphery of a tubing in which corrugations have been formed by the forming means I8, serves to withdraw the tubing Hi from the forming means I8 and to discharge it through the length of the slot I2 into the receptacle Is. The comparative ease with which the individual lengths of tubing I6 may be charged into and discharged from the forming means It through the cooperation of the charging and discharging means of the receiving means with the drum 53 of the receiving means is an important feature of my invention.

The forming, means I8, as best shown in Figs. 1 to 4, includes a circularspindle plate it having a centrally located hub portion H by means .of which it is affixed to. the periphery of the first drive shaft 59. Thus, the spindle plate 13 is rotated upon the first drive shaft 59 concomitantly and at the same speed as the elongated drum 58 of the receiving means I1, for a purpose to be described in greater detail below. The spindle plate 13 has a peripheral groove 14 formed therein which is adapted to receive a belt 15, the belt 15 being trained upon the pulley 45 which rotates the shaft 4| of the first wiping element 36 associated with the feeding means I5. As viewed in Fig. 1 of the drawings, the direction of rotation of the spindle plate 13 upon the first drive shaft 59 is toward the viewer, and the belt 15 is twisted in a conventional manner to reverse the direction of rotation sothat the pulley 45 and the shaft 4I upon which it is mounted rotate in a direction away. from the viewer. There are formed, as may be best seen in Figs. 2 through 4 of the drawings, integrally with the body of the spindle plate 13 a plurality of spindle bosses 80 which provide-longitudinally extending bores or openings 8I adapted to receive sleeve bearings or bushings 82. Reciprocatably disposed within the sleeve bearings 82 and adapted to be axially shifted and rotated therein are hollow spindles 85 having longitudinally extending bores 88 formed therein. In order to facilitate the further description of the forming means I8, the description will be confined to one of the spindle elements of the invention and although th vari ous parts are described in the singular, it will be understood that the parts are duplicated in the other spindles which are mounted in the spindle plate 13.

Secured in one end of the bore 88 of the hollow spindle 85 through the medium of rpm 89, or similar fastener, is one end of a mandrel 88, which is of generally cylindrical configuration and which is possessed of a smooth periphery. The mandrel 88 includes a main body or gripping portion 99 and an auxiliary or forming portion 9| which terminates in a relatively sharp end 92. As may be readily seen from the drawings, the externaldiameter of the gripping portion 90 of the mandrel 88 is substantially equal to the internal diameter of one of the tubings I8 while the external diameter of the auxiliary or formingv portion 9I of the mandrel88 is substantially less than the internal diameter of the'tubing I8, for a purpose tobe explained in greater detail below. The'man-drel 88 is that portion of the forming means I8 upon which the tubing I 8 is supported during the forming of the circumferential corrugations in the peripheral area thereof. Therelatively sharp end 92 of theauxiliary or forming. portion v9| of the mandrel 88 facilitates the registration of the end of the tubing I8 with the mandrel when it is impelled upon the mandrel by means of the charging means I 10.

Although it is conceivablethat the main body or gripping portion 90 ofthe mandrel 88 be capable .of engaging frictionally with the interior of the end of the tubin I8 after it has been impelled or charged thereupon by the charging means I10 so that relative rotational 'or axial movement of that portion of the tubingwith respect to the gripping portion 90 would be prevented, there is provided a positive gripping means 93 which is adapted tosecurely fix the end of the tubing I6 againstrelative axial or rotational movement with respect to the gripping or main body portion 90 of the mandrel 88. The gripping means 93 includes a pair of gripping jaws 91 which are mountedthrough the medium of pins '98 upon a mounting block 94which is secured to the exterior of the end of the. spindle 85 by the pin 89 with which the mandrel 88 is also secured in the end of the spindle 85.

As best shown in Figs. 2 to 4 and 11 and 12 of the drawings, the gripping jaws 91 are mounted for rocking movement upon the pins 98 in the mounting block 94 from a position in which they secure the end of the tubing I6 to the main body portion 90 of the mandrel 88 into a position in which they release the end of the tubing I8. The gripping jaws 91 are provided with forward gripping ends 98 which are adapted to impinge upon the end of the tubing I6 and which have formed on the under and upper sides thereof, as best seen in Fig. 12, arcuate surfaces I00 which are adapted to register accurately with the peripheral area of the tubing I6 secured therebetween. Fixed in each of the gripping jaws 91 is a pin 502 which has secured thereto one end of a tension spring I03 which forces the grippin jaws 91 into closed position upon the surface of the mandrel 88 or the end of a tubing I6 supported thereupon. The tension spring I03 thus serves to normally retain the gripping jaws 91 in closed position upon the mandrel 88. The gripping jaws 91 are also provided with rearward actuating ends 99 which extend into the interior of the bore 88 of the spindle 85 through longitudinal openings or slots I04 formed in the wall of the end of the spindle adjacent the point of attachment of the mandrel 88 and the mounting block 94 to the end of the spindle 85.

Disposed within and occupying the major portion of the bore 86 of the spindle 85 is a cylindrical, elongated push rod I05 which has a forward, gripping jaw actuating end I08 and a rearward, cam contacting end I01. Secured in the jaw contacting end I08 of the push rod I05 at right angles to the longitudinal axis thereof is a pin I08 which extends into the slots I04 formed in the wall of the spindle 85 and which prevents the dislodgement of the push rod I05 from the bore 88 of the spindle 85. The push rod I05 through its forward, jaw actuating end I06 and through its contact with the rearward actuating ends 99 of the gripping jaws 91 is adapted to automatically force open the gripping jaws 91 when it is axially shifted within the bore 88 of the spindle 85 against the ends 99 of the gripping jaws 91 in a manner which will be described in greater detail below. 7

As shown in Figs. 1 to 4 of the drawings, there is mounted upon a frame member II9 which is suitably secured to the bedplate I2 of the base II an annular face cam I20 which is adapted to be contacted by therearward, cam contacting end I01 of the push rod I05 as the push rod I05 is carried in an annular path about the axis of the first drive shaft 59 through the medium of the spindle mounting plate 13. As best shown in Fig. 5 of the drawings, the annular cam I20 includes a dwell portion I2I, a gradual drop portion I22, and a sharp rise portion I23.

' Mounted adjacent the end of the integral spindle boss and encompassing the periphery of the spindle 85, is an annular collar I09 which is adapted to be axially shifted over the surface of the spindle by means of an expansion spring III which encircles the boss 80 and which is seated in an annular flange IIO formed in the collar I 09. As may be best seen in Figs. 2 through 4 of the drawings, the expansion spring I I urges the collar I09 into constant contact with the side of a planetary gear II3 which is fixedly secured to the periphery of the spindle'85 through the V medium of a set screw I I4 and which is in mesh se l-gen with a sung'ear. I. lbwhich as best shown in Fig. I, is mounted upon a second; drive shaft II'B journalledin abearing I [Ea supported upon the frame member H9. I

The. second drive shaft us has a. pulley In mounted thereupon and a belt H8 trained between the ulley I IT and a companion pulley IfI'Ia secured to the motor shaft 59. The second drive shaft H6 is coaxial with and encompasses the first drive shaft 59 but it is, through its direct connection with the motor 23, designed to' rotate at a much higher speed than the first drive shaft 59;. The sole purpose of the second drive shaft H6 is to provide a. means of rotating, the sun gear I I5, which in turn serves to rotate the associ'ated planetary" gear [I3 mounted upon the periphe'ryof the spindle 8E. The sun gear H5 and the planetary gear H3 serve as transmission means by" which the rotation of the second drive shaft Hi may be transmitted to the spindle 8'5 andthus'cau'se the'rotation of the spindle 85 and the mandrel 8a; mounted in the end of the spindle.

Thus, as the spindles fia and their associated push rods I95, "gripping jaws 9i, and mandrels 88 are carried in a circular path upon the spindle plate 13 through the medium of the first drive shaft 59, the spindles- 85 are rotated at a much greater speed about their longitudinal axes through the medium of the second drive shaft I I6, the'sun gear I I5 and the planetary gears I I3. Consequently, there are two paths of rotation for the spindles 85- and their associated gripping jaws 9-1- and mandrels 88; a first, larger and slower path of' rotation caused by and about th'eaxis of the first drive shaft es and a second faster and smaller axis of rotation about the axes of the spindles 85 caused by the second drive shaft I it.

As maybe best seen from Figs. 1 through 4 and 6 through loof the drawings, the die means I21,

which is adapted to form a. circumferential thread or groove inthe periphery ofthe tubings I6 as a portion of the process of formingcircumferenti'al: corrugations in said tubings, is juxtaposed to the-end of the drum 58 of the receiving means I 'I andisadapted to cooperate with the mandrels 88 which: pass -therethrough- Secured toth'e first driveshafiz 59, as lay-means of. a hubporti'on I25, and adapted to beirotated by the. first drive shaft 59 i's' acircular; die mounting plate I24 which. is rotated upon the shaft Edat. thesam'el speed. as the spindleplate'Y-S is rotated and also at the same speed. as the drum 58 is rotated.

Thedie' mounting plate I2 3 is provided with a plurality of holes I23 which are radially spaced adjacent the peripheral edge of the. plate and through which the mandrels 88 are adapted to extend, as is most clearly shown in Figs. 2 to 4 of the drawings. The die mounting plate isso fixed to. the first drive shaft 59 that. the holes I28 formed therein are always in a position to permit the axial entry and rotational movement therein of the mandrels 88 and during the concomitant rotation of the die mountin plate H4 and the spindle plate I3 the holes 526 and the mandrels 88 are in continual registry. In addition, the ends of the longitudinal slots I2 which constitute. the receptacles H of the elongated drum 58 are also in continual registry with the openings I26 in the die mounting plate I24 to permit the passage through the openings I 26 from the ends of the longitudinal slots 12 of the individual lengths of tubing I G'onto the mandrels 83.

As most clearly shown in Figs. 1 and 6 to of the drawings, there is mounted about the holes I26 and adapted to cooperate'with thel'mandrels 38" a number of pairs of die mounting arms I3I and I32'which are individuallysecured tothe sur face; of the die mounting plate I24 thrbugh'thd medium of bolts I29 extending through the plate and secured thereto by means of nuts I301 Since: the constructions of the pairs of the mounting arms I3*-I- and I32 and their associated elements which are mounted about the individual holes I25 in the die mounting plate I24 are simil'ar,'.onl'y one pair of the diemountingarms will be de-- scribed in detail below.

Formed in the lower end of the diemounting arm I3I is a die' blade receiving slot P3 3 and a die blade receiving slot" I 34 is similarly formed in the die mounting arm I32 As best shown in Fig. 9, the die blade receivingslotIBt of the die mounting arm I3I' has an upwardly sloping top wall I35 and an" upwardly sloping bottom wall I36 which are jointed by an obliquely disposedback wall I 37. Thedisposition of the top; bottom andback' walls I35, I36 and I 3? controls the angle at which adie blade I 38-moun-te'd within the: slot I33 is disposed;- The die blade I3 fi issecured within theslot I33 by'means'ofa screw I 3'9 which passes'therethrough and is threadedly engaged in a hole I40- formed in the die mounting arm- I3I. As bestshown in Fig. 1-0 of the drawings, the die blade receiving slot I34 of the die mounting arm- I32 has a downwardlysloping top wall I4'I, adownwardly sloping bottom wall I 42 and an obliquely disposed back wall I43 and is adapted tosuitably position a die blade I44 which is-rertaine'd' within the slot I34 by means of a screw I45 passing therethrough and threadedly engaging a hole I46 in the-arm I32. Those ends-of thedie blades I38 and I44 which contact the peripheral area of the tubing IIG have arcuate forming edges I41 which are adapted to contact the periphery of. the timings- I 6 and form ascore line or groove therein. is b'est shown in'F'ig. 9 of the drawings, the configuration of the die blade mountingslots in the diemounting arms I3 I- and I'32-controls the relationship of the forming edges IZ4'I- of the die blades I 38' and- I44to eachLother and the inter-section ofthe die blades i38 and I44, in turn, controls the pitch between the threads formed. in the surface ofth'e tubing Hi by the formingedges l il of i the: die blades I38 and I44.

The die-blade mounting arms 131 "and :32 are retained "in "a normally closed position "by means of av tension spring. I52, the opposite'ends of which are secured in" holes: I 53 formed' in" ears I5I whichiare'integral'ly formed on the lower'ends of thearms I3I and I32 The'a'ction of the spring I52Tth'us. draws" the die-blades I3l8and I44 into contact with thexsurfaceof a. tubing I6 posh tioned upon the. mandrel'88' andithe normal position of the die blade; mounting? arms I.3'I zinc-1132 is. theiclosed position. Securedto th'exfacerofthe die mounting .plate. I24 and; disposed. between the: upperends of the; die blade: mounting arms I31 and I32-is. acylindrical-spacer elementMB; the diameter: ofjwhich determines.- the. distance which the. arms-I31: and. I3'2 are spaced from each other;. In: other: words, i the: spacer M8" controls the" depth. of the score'line or groove" which i's formed in the-periphery of the tubing I 6-by the die blades I38 and I hy-preventing the'ar'm's I31 and I32" from carrying the blades-I38 and I44 any' deeper into the surface-oft'h-etubing I6 than a predetermined distance; 'Ofcourse, the spacer I48 is interchangeable withother' similar spacers'and the depth ofthescore' line. or groove be readily controlled. 1

assua e i As best shown in Figs. 1 through 4 and 6 through 8 of the drawings, there is mounted on one of the frame members 43 through the medium of bolts I55 and nuts I56 anarcuate edge cam I51 whose lower edge I58 is adapted to control and to cause the opening of the die blade mounting arms I3I and I32. The arcuate lower edge I58 of the cam I51 is substantially concentric with the edge of the .die mounting plate I24 and is adapted torbe contacted by a roller cam follower I60.

, The cam, follower I60 is rotatably mounted upon an elongated extension I6! of the .die blade mounting arm I3! through the medium of a bolt I62 .and a nut I63, the bolt extending through concentric openings'in the. roller I60 and the end of the arm I6I. Theunder side of the elongated extension I6! of thezarm I3! is provided with an auxiliary cam surfaceI64 which is adapted. to be contacted by a..cam ear I65 formed upon the upperend of the die blade mounting arm I32.

.The upperextension I6! of the arm I3! protrude's beyond the edge of the die mounting plate I24 and is maintained in .an upwardly extending position by the closing action of the tension spring I52 upon the die blade mounting arm I3I. When the rotation of the. die mounting plate I24 carries the follower .I60ontothe arcuate edge I58 of the cam I51, the extension I6! of the arm I3! is driven downwardly .and thecam surface I64 simultaneously contactsrthe cam ear I65 formed onthe upperend of the arm I32. In this manner,

the die blade mounting arms I3! and I32- are simultaneously pivotedupon the bolts I29 away from each. other and the die blades I38 and I44 are removed from contact with the periphery of the tubing I6. As can be best seen from Fig. 6 of the-drawings, the die blade mounting arms I3! and I32 are held in their open position by the cooperative action, of the. follower I60 with the cam I51 as the drum .58 of the receiving means "passes through the first, loading station, the secondecharging station and the third, discharg+ ing station in order that the tubings .I6 may be charged upon the mandrels 88 and discharged therefrom .at the completion of the. formingof the corrugations inthe tubings I6. I When the rotation of the die mounting plate I24 carriesthe roller follower I60 out of contact with the under side I58 f..the cam. I51, the re-. lease of the roller .follower' I60 and the concomitantzrelease of .the elongated arm I6I per: mits the tension spring I52 to carry the die blades I38 and I44 against the periphery of the tubings I6; There is thus .provided by this construction an automaticmeans for closing and opening the die blades I38 and I44 to permit tubing to be charged uponanddischarged from the mandrel 08. This is an important feature of my invention since it greatly facilitates and expedites thepformation of .the corrugations in the tubingbecause the'tubing can be readily'charged upon and discharged from the-forming means I8.

Disposed contiguously to the surface of, the drum58 of the receiving means, I1 area number of shields 138 which restrain: any lengths of tubing I6 from being dislodged out of the longitudinal s1ots'12 formed in the-surface ofthe drum. Posi tioned at the end of the drum 58 adjacent the receptacle I9 is an end plate I89 which is suitably mounted upon the bedplate I2 and which is adapted to prevent the'corrugated lengths ofv tubing from traveling beyond the end of the slots 12 a sufficient distance to permit them to. fall to th floor r e tha r ni the ee iie e practised the appara u "I matched illustrated by following a length of tubing I6 through the apparatus in the process of having corrugations formed therein. A number of lengths of tubing I6 are initially loaded into the hopper 25 of the feeding means I5 and the weight of the tubings I6 carries them down in the hopper to the juncture of the main body portion 26 with the auxiliary bodylportion 21 of the hopper. At thispoint the tubings l6 drop by gravity into the narrow channel 3! formed by the auxiliary body portion 21 and some of the tubings I6 are urged downwardly therein by the first wiper element 36 while themajor number of the tubings are urged away from the opening to the channel 3! by the second wiper element 41 to prevent the jamming cfthe tubings at the mouth of the channel 3!, as bestshown in Fig. 13. The tubings I6 drop downwardly in the channel .3! .and fall into one of the elongated slots I2 in the drum 58. The tubing !6 drops into the slot 12 at the first, loading station of the drum 58 and the rotation of the drum 58 carries the tubing I6 in the slot 12into the second, leading station in which the peripheral area of the tube I6, as best seen in Fig. 6, is contacted by the r apidly rotating wheel I12 of the charging means I 10. I

Y The rapidly rotating wheel I12 of the charging means I16 impels the tubingIIi-upon the end ofthe mandrel 88 through the opening I26 in the die mounting plate I24 and causes the end of the tubing I6 to, assume a position upon the gripping portionflfi of the mandrel 88 between the open gripping jaws 61K. The passage of the tubing I6 over the mandrel 88 and through the opening I26 in the die mounting plate I24 is permitted because the die blade-mounting arms I3! and I32 are held open by the cam I51 as the die mounting plate I24 and the .drum58 are carriedthrough the second, charging. station of the apparatus.

\ As best shown in Fig. 2 of thedrawings, the push rod I05, when its cam contacting end I01 rides upon the dwell portion I2l of the cam I20, is driven, to the right against the jaw opening ends 99 .of the. gripping. jaws 91, which are in their n rmally closed, position prior to the time when the end I51 of the push rod I05reaches thedwell portion I2! of the camJ'I20- When the end I01 ofthepushrod I05 strikes the'dwell portion I2! of ,the'cam I20, thepush rod is driven to the rightagainst the jaw'opening arms 99 of the gripping jaws 9'1. Since the spring I03 which holds the gripping portions 98 ofthe gripping jaws 9! in the closed position resists'the action of the jaw opening end I06 of the push rod I05, the push rod carries. the jaws 91, the spindle 85, the planetary gear II3 andthe collar I09 to the right against the force .of .the expansion spring III; until the collar, seatsupon'the end of the integral boss of the spindle plate 13.

-,Wl'ien the collar 09 and the planetary gear I I3 are seated against thelend of the integralboss 60 of the spindle; plate I3, as shown .in Fig. 2, the dwell portion; I2 Iof the .cam I20 continues to urge the push rod- I tothe right against the force of the ja w closing sprin'gll03 and by its action against the arms 99 of the jaws 91. forces the jaw grippingportions 98 of the jaws 91 away from and put of contact with the surface of a tubing I6 in which corrugations have been previously formed. The gripping jaws91 are opened simultaneously with the removal of the die blades I38.

and" I44 from contact with theperiphery of the tubing I6 and the tubingIIi is thus automatically released topermit its discharge from the mandrel s 8.5- se re ate 9! en i d earms m.

17 by the drop I22 of the cam I20, the tubing I6 collapses in its scored area and forms corrugations I28a which are deeper than and which are defined by the initial thread I28 formed by the die blades I38 and I44.

In this manner, circumferential corrugations may be formed in the tubing I 6 Without materially altering the wall thickness of the tubing in the corrugated area since the corrugations are formed not by drawing or cutting the material of the tubing but by deforming the material of the tubing by an initially formed score line or groove in the pattern of the corrugations and then axially compressin the tubing to cause the deformation of the threaded area into deeper corrugations. Essentially, my invention, as a method, consists in forming a score line or groove in the periphery of a tubing and then axially compressing the tubing to cause the collapse thereof in the scored regions to form corrugations which are defined by the score lines initially formed in the tubing.

As may be best seen from Figs. 2 through 4 of the drawings, as the formation of the corrugations in the periphery of the tubing I6 takes place, the axial shifting of the mandrel upon which the tubing is supported, as permitted by but controlled by the face cam I20, causes the simultaneous axial shifting of the spindle, the planetary gear I I3 and the collar I03 which is mounted about the spindle 85. When the lowest point of the gradual drop I22 of the cam I20 is reached, as best seen in Fig. 4, the corrugating action is completed and the tubing I6 is ready to be discharged from its position upon the mandrel 88.

The mandrel 88, at the completion of the corrugating process, has shifted its maximum distance to the left, the gradual drop I22 of the cam I20 has reached its lowest point, the planetary gear II 3 has shifted to the left in conjunction with the spindle 85 to its extreme point of axial movement, and the spring I II is in an expanded condition. As will be noted from the drawings, during the entire corrugating process the spindle plate 13, the die mounting plate I 24 and the drum 58 have been rotated by the first drive shaft 59 at the same speed and the mandrel 83 has thus been extended through the opening I2 6 in the die plate I24 during the entire corrugating process to permit the die blades I30 and I24 to form the thread in the periphery of the tubing I6. The gradual shifting of the mandrel to the left is graphically shown in Figs. 2 through 4 of the drawings and Fig. 4, particularly, shows the complete formation of a corrugated area in a tubing I6 prior to the discharge of the tubing I6 from the mandrel 88.

The pitch of the score line formed in the periphery of the tubing I6 is, of course, controlled by the angle at which the die blades I38 and I44 are disposed in reference to each other. As indicated above, we will presume that the pitch of the score line is one-quarter inch, thus allowing four fully completed score lines to an inch. Since the formation of the score line I28 and the subsequent corrugation I28a in the tubing I6 must take place in one rotation of the spindle plate 13, the die plate I24 and the drum 58 or, in other words, the corrugations must be formed in the tubing I6 between the second, charging station I86 and the third, discharging station I81, the mandrel must be rotated four times for each rotation of the spindle plate, die plate and drum 18 in order to form the four score lines in the tubing l6.

In the formation of the four score lines, the mandrel is thus rotated by means of the planetary gear I I3 and the spindle four times during one revolution of the spindle plate 13 and. its associated die plate and drum. Simultaneously, since the lead of the four score lines, having a pitch of one-quarter inch each is one inch, the scored portion of the tubing 56 is advanced one inch axially to the left although the mandrel is only permitted to move one-half inch by the face cam I26. In this manner, the scored area of the tubing it which would normally occupy one inch of the surface length of the tubing I6 is permitted to occupy only one-half inch of the length of the tubing and the corrugations are substantially twice as deep as and have half the pitch of the initial score lines formed in the tubing I6.

It is obvious, of course, that the pitch of the score line formed in the tubing I6 may be controlled by altering the respective angles of the die blades I38 and I44, while the number of score lines formed in the tubing will be controlled by the number of times the mandrel 88 is rotated between the die blades during the one rotation of the spindle plate, die plate and drum. It i also obvious that. the depth of the corrugations is controlled by the amount of axial movement allowed to the tubing I B by the cam I20, since the amount of compression that takes place is controlled by the extent to which the cam I 26 limits the axial movement of the tubing I6 upon the mandrel 38. Thus, the characteristics of the corrugations so far as number and the depth thereof are concerned may be controlled by merely changing the pitch of the die blades, altering the speed of rotation of the mandrel and changing the drop of the controlling cam I20.

Upon the completion of the corrugations I280, in the surface of the tubing I6, the spindle I65 strikes the dwell portion I2I of the cam I20 and drives the mandrel 88 to the right. When the maximum extent of travel permitted to the spindle 85 by the gear H3 and the collar I 09 fixed thereto takes place, the push rod I05 shifts axially to the right under the compulsion of the dwell portion I2I of the cam I20 and forces open the gripping jaws 91 to release the end of the tubing I6. Simultaneously, the die blade mounting arms I3I and I32 are forced open by the contact of the follower I60 with the arcuate under side I58 of the cam I51. The tubing I6 is now ready to be discharged from the mandrel 88 and the slot 12 of the drum 5B is carried into the third, discharging position in which the rapidly rotating wheel I15 of the discharging means I13 impinges upon the periphery of the tubing and dislodges it from the mandrel, impelling it swiftly to the right and to the end of the drum 58 from which it drops into the receptacle I9.

There is shown in Fig. 15 of the drawings an alternative embodiment of the spindle construction of my invention. In this embodiment, the

spindle I16 is formed in two parts and includes a first or outer sleeve I11 which is disposed within the sleeve bearing 82 adjacent the face of a cam segment I20m which serves to unlock the gripping jaws 91 but which does not extend beyond the point at which the jaws are opened and closed and a second or inner sleeve I18 which provides the mounting for the gripping jaws 91 and the mandrel 88. The first or outer sleeve provides a bore H14; in which the second sleeve [18 is adapted to reciprocate and the second sleeve H8 is provided with a bore H80: which is co-axial with the bore l'ila of the first or outer sleeve Ill. The push rod Hi passes through both the bore Illa and the bore 118a and an expansion spring H9, which has one end seated against the end of the bore Ilsa of the inner sleeve H8 and its other end seated against a plug 18E! which is threadedly engaged in the end of the outer sleeve HT, encircles the push rod 105. The expansion spring He serves to force the inner sleeve N8 of the spindle H6 to the right within the bore Illa of the outer sleeve H1.

To prevent the inner sleeve N8 of the spindle I16 from being discharged completely from the bore Illa of the outer sleeve Ill by the action of the spring lie, oppositely disposed slots l8! are formed in the wall of the outer sleeve Ill and stops pins H32 inserted in the wall of the inner sleeve H8 are adapted to contact the ends of the slots 18! to prevent the complete dislodgement of the inner sleeve H8 from the bore ll'la. A snap ring i3 3 which encircles the end of the outer sleeve ill and projects against the face of the spindle plate 33 serves to prevent the dislodgement of the spindle H6 from the bore of the sleeve bearing 82.

When the corrugations are being formed in the periphery of the tubing it and the mandrel 88 and the tubing mounted thereupon are being forced axially to the left by the scoring action of the die blades I38 and M4, the axial movement is transmitted through the mandrel 88 into the inner sleeve N8 of the spindle assembly 116. The movement of the sleeve H8 to the left is resisted, to a certain degree, by the expansion spring ill? and this resistance must be overcome by the scoring action of the die blades upon the periphery of the tubing i8. Thus, the spring we acts in exactly the opposite fashion to the spring iii which is mounted upon the exterior of the boss 8% in the embodiment discussed above, since in the previous embodiment the spring IH serves to assist to a small degree, the axial shifting of the mandrel 8% and the spindle 85 as induced by the threading action of the die blades upon the peripher of the tubing. In the present embodiment, the provision of the expansion spring H9 in the two-part spindle [l5 serves to set up a resistance to the scoring action of the die blades upon the surface of the tubing it and causes a corrugating action to take place in the periphery of the tubing by serving to resist the axial movement of the mandrel BS in the same manner that the cam I 2! does in the previously discussed embodiment. The spring we is the motion limiting means of the present embodiment. In this manner, corrugations which are more sharply defined and which are of greater depth may be formed in the periphery of the tubing is without materially altering the adjustment of the die blades or changing the characteristics of the face cam.

Although I have shown and described two emboidments of my invention herein for the purpose of illustrating the manner of construction and the mode of operation of my invention, it will, of course, be understood that I do not intend to limit my invention to the details of such emboidments since various changes, modifications and substitutions may be made therein without necessarily departing from the spirit of the invention and I, therefore, wish to be accorded the full scope of the following claims.

'I claim as my invention:

1. In an apparatus for creating circumferential corrugations in tubing, the combination of: feeding means adapted to supply uncorrugated tubing; continuously rotatable receiving means adapted to receive said tubing from said feeding means; charging means positioned adjacent said receiving means; continuously rotatable forming means positioned adjacent said receiving means adapted to receive a tubing impelled from said receiving means by said charging means; and discharging means positioned adjacent said receiving means adapted to discharge a tubing from said forming means.

2. In an apparatus for creating circumferential corrugations in tubing, the combination of feeding means adapted to supply uncorrugated tubing; continuously rotatable receiving means adapted to receive said tubing from said feeding means having a first, loading station at which said tubing is delivered to said receiving means, a second, charging station at which said tubing is impelled from said receiving means and a third, discharging station at which said tubing is discharged from said receiving means; charging means positioned adjacent said receiving means; continuously rotatable forming means positioned adjacent said receiving means adapted to receive a tubing impelled from said receiving means by said charging means; and discharging means positioned adjacent said receiving means adapted to discharge a tubing from said forming means.

3. In an apparatus for creating circumferential corrugations in tubing, the combination of: feeding means adapted to supply uncorrugated tubing; receiving means adapted to receive said tubing from said feeding means, said receiving means including an elongated drum having a plurality of tubing receptacles formed therein and each of said receptacles being adapted to be disposed successively at a first, loading station, a second, charging station and a third, discharging station; charging means positioned adjacent said receiving means; forming means positioned adjacent said receiving means adapted to receive a tubing impelled from said receiving means by said charging means; and continuously rotatable discharging means positioned adjacent said receiving means adapted to discharge a tubing from said forming means.

4. In an apparatus for creating circumferential corrugations in tubing, the combination of: feeding means adapted to supply uncorrugated tubing; receiving means adapted to receive said tubing from said feeding means; charging means positioned adjacent said receiving means, said charging means including a rotating member adapted to contact the surface of said tubing to impel it from said receiving means; forming means positioned adjacent said receiving means adapted to receive a tubing impelled from said receiving means by said charging means; and discharging means positioned adjacent said receiving means adapted to discharge a tubing from said forming means, said discharging means including a rotating member adapted to contact the surface of said tubing to draw it from said forming means and discharge it from said receiving means.

5. In an apparatus for creating circumferential corrugations in tubing, the combination of: feeding means adapted to supply uncorrugated tubing, said feeding means including a hopper having a main body portion and an auxiliary body portion, said auxiliary portion having an open- 21 1 ing formed therein, and said feeding means' 'also including a wiper means adapted to impel said tubing downwardly in said auxiliary bodysportion; receiving means adapted to receive-Jisaid tubing from said feeding means; charging means positioned adjacent said receiving means; forming means positioned adjacent said receiving means adapted to receive a tubing impelled from said receiving means by said charging means; and discharging means positioned adjacent'said receiving means adapted to discharge a tubing from said forming means.

6. In an apparatus for creating circumferential corrugations in tubing, the combination of feeding means adapted to supply uncorrugated-situbing', said feeding means including a hopper having a main-body portion and an auxiliary body portion, said auxiliary portion having an opening formed therein and said hopper having another opening formed therein at the juncture of said main body portion and said auxiliary portion, first wiper means positioned adjacent the opening in said auxiliary portion adapted to urge said tubing. downwardly therein and second .wiper means positioned at said juncture opening adapted to move said tubing upwardly; receiving means adapted to receive said tubing from said feeding means; charging means positioned adjacent said receiving means; forming means positioned adjacent said receiving means adapted to receive a tubing impelled from said receiving means by said charging means; and discharging means positioned adjacent said receiving means adapted to discharge a tubing from said forming means.

7. In an apparatus adapted to create circumferential corrugations in tubing, the combination of: a frame; and forming means for said tubing mounted upon said frame, said forming means including a mandrel having a smooth circumference, a gripping portion having an external diameter substantially equal to the internal diameter of said tubing and a forming portion having an external diameter substantially less than the external diameter of said gripping portion, gripping means for holding said tubing upon said mandrel and die means adapted to impinge upon the periphery of said tubing and to form a circumferential score line thereupon.

8. In a forming assembly adapted to create cir- V curnferential corrugations in tubing, the combination of: an axially shiftable mandrel adapted to support said tubing; die means movable toward and away from said mandrel adapted to impinge upon and form a circumferentialscore line in the periphery of said tubing and acting in cooperation with said score line to axially shift said tubingin conjunction with said, mandrel; and movement limiting means partially opposing the die-induced axial motion of said mandrel so that said tubing will also be shifted axially in reference to said mandrel to cause said tubing to collapse in the scored region thereof to form corrugations therein.

9. In a forming assembly adapted to create circumferential corrugations in tubing, the'cpmbi nation of: supporting means for said "tubing adapted to be positioned within the interior of said tubing and to have one end of said tubing retained thereupon to prevent relative motion between said end of said tubing and said supporting means; and die means movable toward and away from said supporting means adapted to impinge upon and form a circumferential score line in the periphery of said tubing, said die means being adapted to urge the scored portion of said tubing axially of said supporting means to collapse said scored portion to form corrugations therein.

10. In a forming assembly adapted to create circumferential corrugations in tubing, the combination of: supporting means adapted to be positioned Within the interior of said tubing and to have one end of said tubing retained thereupon to prevent relative motion between said end of said tubing and said supporting means; rotatable die means movable toward and away from said supporting means adapted to impinge upon and form a circumferential score line in the periphery of said tubing; and rotational means adapted to rotate said supporting means relative to said die means'to cause the formation of said score line in said tubing, said die means advancing the scored area of said tubing axially in reference to said supporting means and said one end of said tubing to cause said scored area to collapse into corrugations.

11. In an apparatus for creating circumferential corrugations in tubings, the combination of a frame; receiving means mounted in said frame having a plurality of receptacles formed therein adapted to receive said tubings; and forming means adapted to be charged with said tubings from said receiving means, said forming means including a plurality of supporting means disposed adjacent the ends of said receptacles, gripping jaws mounted on each of said supporting means for holding one end of each of said tubings against relative axial or rotational movement in reference to said supporting means, die means movable toward and away from said supporting means adapted to impinge upon said tubings and form circumferential score lines therein, and rotating means adapted to rotate said supporting means relative to said die means to causesaid die means to form a score line in each of said tubings and to induce the axial movement of said scored portion.

12. An apparatus as set forth in claim 11 in which said receiving means is constituted by an elongated drum and said receptacles in said drum are constituted by a plurality of substantially hemispherical grooves, circumferentially spaced upon the periphery of said drum and arranged substantially parallel to the axis thereof.

13. In an apparatus for forming circumferen tial corrugations in a tubing, the combination of: a frame; a rotatable spindle plate mounted upon a first drive shaft; a spindle journalled in said plate having cam contacting means thereon; a second drive shaft having transmission means adapted to rotate said spindle in said spindle plate; a mandrel, on which the tubing may be held, mounted fixedly in one end of said spindle to be rotated thereby; die means movable toward and away from said mandrel including die blades for engaging the periphery of said tubing; and cam means mounted on said frame adapted to be contacted by said cam contacting means.

14. An apparatus as defined in claim 13 having gripping jaw means mounted on said spindle adapted to hold one end of said tubing upon said mandrel against relative movement in reference thereto.

15. An apparatus as defined in claim 14, in which said cam contacting means is a push rod on said spindle and contacts said jaw means and is adapted to open said jaw means to release said tubing when axially driven against said jaw means by said cam.

16. An apparatus as defined in claim 15 in which said spindle is axially movable in said spindle plate and the axial movement of said spindle is controlled by the rise and drop of said cam.

17.. An apparatus as defined in claim 13 in which said spindle is axially movable in said spindle plate and the axial movement of said spindle is controlled by the rise and drop of said cam.

18. An apparatus as defined in claim 1'7 in which the axial movement of said push rod as caused by said cam causes said push rod to control the axial and opposite movement of said spindle in said plate.

19.. An apparatus as defined in claim 18 in which said spindle bears jaws operable by said push rod which retain one end of a tubing upon said mandrel against relative movement in reference thereto.

20;. An apparatus as defined in claim 19 in which said spindle incorporates stop means limiting the axial movement thereof caused by said cam as transmitted by said push rod and said push rod is adapted to open said jaws when said stop means limits said axial movement to release said tubing from said mandrel.

21. An apparatus as defined in claim 20 in which said die means are positioned on either side of said tubing and are adapted to form a score line in said tubing.

22. An apparatus as defined in claim 21 in which said die means are mounted in retractable arms.

23. An apparatus as defined in claim 22 in which said retractable arms are mounted upon a cam follower plate rotatabl in conjunction with said spindle plate upon said first drive shaft.

24. An apparatus as defined in claim 23 in which a cam follower is adapted to retract said arms and said die means out of contact with said tubing simultaneously with the release of said one end of said tubing by said gripping jaws.

25. An apparatus as defined in claim 2 in which a die opening cam mounted upon said frame is adapted to cause said cam follower to open said arms.

26. A method of forming circumferential corrugations in a tubing including the steps of: forming a circumferential score line in said tubing by applying a die only to the outer periphery of said tubing; and axially compressing said tubing at said score line to cause the "collapse of the scored portion of said tubing into corrugations.

27. A method of forming circumferential corrugations in a tubing including the steps of: fixing one end of said tubing upon an axially shiftable smooth support; forming a circumferentialscore line in said tubing by applyin a dieto the periphery of said tubing-while on said smooth support; and axially moving the free end of said tubing more rapidly than said fixed end is moved to collapse said tubing at said thread.

28. A method of forming circumferential corrugations in a tubing including the steps of: mounting said tubing on a smooth support; fixing one end of said tubing against axial movement relative to said support; forming a spiral score line in said tubing by applying a die to the periphery of said tubing while on said smooth support; and axially compressing said tubing by means of said spiral score line in the direction of said fixed end to collapse said tubin into corrugations in the scored area thereof.

29. A method of forming circumferential corrugations in a tubing including the steps of mounting said tubing on a smooth support; fixing one end of said tubing against axial movement relative to said support; rotating said support to rotate said tubing; forming a circumferential score line in said tubing by the application of die means to the periphery thereof while in said smooth support; and axially compressing said tubing by means of said score line in the direction of said fixed end to collapse said tub ing into corrugations in the scored area thereof.

30. .A method of forming circumferential corrugations in a tubing including the steps of: placing only the periphery of said tubing in a die; establishing relative rotational movement between said die and said tubing; forming a circumferential score line in said tubin by means of said die and the relative rotation between it and said tubing; and axially shifting the scored portion of said tubing to collapse said scored portion into corrugations.

31. A method of forming circumferential corrugations in a tubing including the steps of: mounting one end of said tubing upon an axially shiftable support; fixing one end of said tubing on said support against movement relative thereto; contacting only the periphery of said tubing with die means; rotating said tubing relative to said die means; shifting axially said fixed end of said tubing with said support; fori ing a circumferential score line in said tubing; and axially shifting the scored portion of said tubing toward said fixed end more rapidly than said fixed end axially shifts to cause the collapse of said scored portion into corrugations JOSEPH B. FRIEDMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 589,694 Capewell Sept. 7, 1897 700,662 Koflier May 20, 1902 1,210,895 Brinkman Jan. 2, 1917 1,843,395 Lauterbach Feb. 2, 1932 1,860,989 Brinkman May 31, 1932 1,954,881 List Apr. 1'7, 1934 2,002,896 Kopetz May 28, 1935 2,093,155 Muller Sept. 14, 1937 2,390,533 Hill Dec. 11, 1945 

